Printing question

[barry99705]

What causes the little boogers on the sides of prints? This is Microcenter Inland White ABS, extruder temp is 210C.

[img]https://lh3.googleusercontent.com/-31kt ... 121552.jpg[/img]

[nitewatchman]

Boogers are formed at end point retractions. Commonly people try to manipulate the retraction and retraction rate to control, this especially if there is stringing associated with the move. But in some cases the problem has already occurred by the time the retraction has been applied.

This is results from pressure in the Bowden tube caused by "pushing the rope". Even though the extruder stops at the end of the move. the pressure in the tube keeps putting material through the nozzle. The retraction helps by pulling back the filament to lower the pressure, but I think the damage is already done.

This is where "Coast" comes into play. The coast parameter stops the filament feed at some distance, set in the slicer program, and allows the residual pressure to supply filament for the remainder of the move bleeding the pressure to a much lower value. Too much coast and there is a gap at the end of the path, too much and there is a blob or booger. FOR ME, this has the greatest effect on "boogers".

For example with an E3Dv6 Hot End, a BondTech Extruder and ABS (substitute PLA by lowering the temperature), I run the following parameters.

Temperature - 230-235C
Bed - 100C
Traverse - 250mm/sec
Print 75-125mm/sec
Outside perimeters - 60%
Retraction - 4mm
Retraction velocity - 15mm/sec
Extra Restart - 0mm
Coast - 1.25mm
Retraction Vertical Lift - 0.5mm

With the E3Dv6, I run 4mm with all filaments, PLA included. Jamming is only a problem when a rat pellet pulls off the end of the filament during filament changes. Then it is remove the nozzle, pull the PTFE Tube and push the dropping out the top of the hotend. I don't get retraction related jams.

gary

[Eaglezsoar]

Gary, what slicer are you using for those settings?

[nitewatchman]

Gary, what slicer are you using for those settings?

S3D

I have really grown to like it. Key points are the ability to run multiple processes and support manipulation. You could literally run a different settings for each layer. Support can be modified, added or subtracted manually in the setup.

Tonight I was printing a part that requires a set of ball bearing to be inserted into the print. With S3D I can tell it to print the bottom half using a process that only print from 0 to 10.5mm height, manually insert the bearings and then run the second program where the S3D process print from 10.5mm to 44mm height.

gary

[Eaglezsoar]

I never purchased that program because they refused to offer a trial version.
I may have to rethink this and actually purchase the S3D software. Thanks Gary!

[mhackney]

I've bought S3d twice. The first time I sent it back for a refund. When v3 came out I bought it again. It is much better than it was before but it still has issues that prevent me from using it all the time. I still use KISS for 95% of the stuff I do. I haven't been able to use it for my newest dual extrusion work.

But let me be clear, I have VERY high quality of print requirements. Can S3D make a print? Sure? Can it support dual extruders? Sure. But the quality of the final product is no where near where I need it to be. I have invested quite a few hours in controlled experiments and studying it's gcode output with S3D and would assert that I probably know how it works inside and out as well as anyone. I know what the issues are and they can't be tweaked in its configuration settings.

[nitewatchman]

I've bought S3d twice. The first time I sent it back for a refund. When v3 came out I bought it again. It is much better than it was before but it still has issues that prevent me from using it all the time. I still use KISS for 95% of the stuff I do. I haven't been able to use it for my newest dual extrusion work.

But let me be clear, I have VERY high quality of print requirements. Can S3D make a print? Sure? Can it support dual extruders? Sure. But the quality of the final product is no where near where I need it to be. I have invested quite a few hours in controlled experiments and studying it's gcode output with S3D and would assert that I probably know how it works inside and out as well as anyone. I know what the issues are and they can't be tweaked in its configuration settings.

No complaints from me, I have tried the others and like the results with S3D and would buy it again.

While it is true that there is no free trial, if you don't like it after 30 days they will refund the purchase.

gary

[Eaglezsoar]

[quote="mhackney"]I've bought S3d twice. The first time I sent it back for a refund. When v3 came out I bought it again. It is much better than it was before but it still has issues that prevent me from using it all the time. I still use KISS for 95% of the stuff I do. I haven't been able to use it for my newest dual extrusion work.

But let me be clear, I have VERY high quality of print requirements. Can S3D make a print? Sure? Can it support dual extruders? Sure. But the quality of the final product is no where near where I need it to be. I have invested quite a few hours in controlled experiments and studying it's gcode output with S3D and would assert that I probably know how it works inside and out as well as anyone. I know what the issues are and they can't be tweaked in its configuration settings.[/q

Dang , now I won't buy it and stick with Kiss which I did buy. If Michael says that there are issues with it then there are issues with it.
Although it is true that I do not have the same perfect print requirements that Michael has because of his business I still do not want a product that is already
worse than Kiss. Kisses for everybody!

[Windshadow]

I took a look at KISS and selected the unstable one Version 1.4.5.10 as it said it has delta support... but after looking at it I think until I learn a lot more I better stay with MC
I sent the S3D folks an email asking about refunds bit i have not had a response if they will will give me an undertaking that i can get a refund after X days if not satisfied I will risk the $150 for it.


after all at current interest rates i doubt I could by a beer with 30 days of .005% checking account interest on $150